136638849 has 4 divisors (see below), whose sum is σ = 182185136. Its totient is φ = 91092564.

The previous prime is 136638787. The next prime is 136638851. The reversal of 136638849 is 948836631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 136638849 - 2⁷ = 136638721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 136638798 and 136638807.

It is not an unprimeable number, because it can be changed into a prime (136638869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22773139 + ... + 22773144.

It is an arithmetic number, because the mean of its divisors is an integer number (45546284).

Almost surely, 2^136638849 is an apocalyptic number.

It is an amenable number.

136638849 is a deficient number, since it is larger than the sum of its proper divisors (45546287).

136638849 is an equidigital number, since it uses as much as digits as its factorization.

136638849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45546286.

The product of its digits is 746496, while the sum is 48.

The square root of 136638849 is about 11689.2621238468. The cubic root of 136638849 is about 515.0602864041.

The spelling of 136638849 in words is "one hundred thirty-six million, six hundred thirty-eight thousand, eight hundred forty-nine".